15=36-7x

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Solution for 15=36-7x equation: 



15=36-7x

We move all terms to the left:

15-(36-7x)=0

We add all the numbers together, and all the variables

-(-7x+36)+15=0

We get rid of parentheses

7x-36+15=0

We add all the numbers together, and all the variables

7x-21=0

We move all terms containing x to the left, all other terms to the right

7x=21

x=21/7

x=3

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